A SYNOPSIS OF THE APHIDIDAE 13 



Alate viviparous females common. Venation normal, the third discoidal being 



twice-branched. Not on Quercus spp 2 



2. Antennae short, stout, with oval transverse sensoria (fig. 13). Forming galls 

 on Arctostaphylos spp. (and Arbutus spp.) _ coweni (Ckll.) 



Antennae longer and narrower with circular sensoria (figs. 9, 14-17). Living 



under thick masses of white flocculence on Fagus spp fagl (Linn.) 



1. Phyllaphis coweni (Ckll.) 



Figure 13 



Cockerell, Can. Ent., vol. 37, pp. 391-392. 1905. Pemphigus (orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 4, pp. 559, 1911. Cryptosiphum tahoense 



n.sp. (desc.). 



Davidson, Jour. Econ. Ent., vol. 5, p. 404, 1912 (list). 

 Essig, Pom. Jour. Ent. Zool., vol. 7, pp. 187-195, 1915 (desc.). 

 Records. Arctostaphylos manzanita; Oakville, Napa County, February, 1913 

 (E. L. Brannigan) ; Mount Diablo, Contra Costa County (Davidson) ; Jasper 

 Eidge, Santa Clara County, October, 1914 (E. A. Cornwell) ; Pine Hills, San Diego 

 County, June, 1916.* A. pumella, A. tomentosa, Lake Tahoe, August, 1911 

 (Davidson) : A. glauca, Alpine, San Diego County, June, 1916. 



This species is found more or less abundantly throughout the state 

 wherever its host plants occur. Essig (1915) states it is found 

 throughout the Rocky, Sierra Nevada, and Coast Range mountains, 

 being more abundant in the central and northern parts of the state. 

 The author has found it to be extremely abundant in the Cuyamaca 

 and Laguna mountains in the extreme southern part of the state. 

 The insects can be found at any time of the year in the galls on 

 manzanita although most abundantly in the early fall. Collections 

 by the author in June showed that the stem mothers and young vir- 

 gogeniae only were present. A few weeks later the alate females were 

 abundant, while in August the sexual es begin to appear. However, 

 the alate viviparous females have been found in October and in 

 February. This species forms galls on the leaves, and flower and 

 fruit stalks of its host. Usually there is but one gall to a leaf, 

 although sometimes four or five may be found. When first formed 

 these galls are concolorous with the leaves; but as they become older 

 they turn more and more reddish in color, until when mature they are 

 a very bright red. 



2. Phyllaphis fagi (Linn.) 



Figures 9 to 12 



Linnaeus, Syst. Nat., vol. 2, p. 735, 1735. Aphis (orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 376, 1910 (list). 



Eecords. Fagus sp., Palo Alto, 1910 (Davidson) ; Fagus sylvatica, Stanford 

 University, April to May, 1915. 



* Records in which no collector 's name is mentioned refer to collections made 

 by the author. 



